package tij4.concurrent.source;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SimplePriorities implements Runnable{

    private int countDown = 5;
    private volatile double d;
    private int priority;

    public SimplePriorities(int priority) {
        this.priority = priority;
    }

    @Override
    public String toString() {
        return Thread.currentThread() + " : " + countDown;
    }

    @Override
    public void run() {
        Thread.currentThread().setPriority(priority);
        while (true){
            for (int i = 0; i < 10000000; i++) {
                d += (Math.PI + Math.E) / (double)i;
                if(i % 1000000 == 0){
                    Thread.yield();
                }
            }
            System.out.println(this);
            if(--countDown == 0)
                return;
        }

    }

    public static void main(String[] args) {
        ExecutorService executorService = Executors.newCachedThreadPool();
        for (int i = 0; i < 5; i++) {
            executorService.execute(new SimplePriorities(Thread.MIN_PRIORITY));
        }
        executorService.execute(new SimplePriorities(Thread.MAX_PRIORITY));
        executorService.execute(new SimplePriorities(Thread.NORM_PRIORITY));
        executorService.shutdown();
    }
}
